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<p>[QUOTE=&quot;Conder101, post: 1865506, member: 66&quot;]What I have never understood is why they have never tried excavating the Money Pit using a caisson system.&nbsp; Pressurized air inside the caisson keeps the water out and as the soil is excavated the caisson slides down into the ground.&nbsp; As it drops a water tight collar is added above it continuously so water can&#039;t enter above the caisson and it also supports the walls of the pit to prevent collapse.&nbsp; That is how they used to build the underwater footings for bridges.[/QUOTE]</p><p><br /></p>

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